Metrological Performance of Hybrid Measurement Technique Applied for the Lamb Waves Phase Velocity Dispersion Evaluation

Draudvilienė, Lina; Meškuotienė, Asta; Tumšys, Olgirdas; Mažeika, Liudas; Samaitis, Vykintas

doi:10.1109/access.2020.2974586

Cited by 7 publications

(9 citation statements)

References 38 publications

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“…A comparison of the obtained results in the case of GFRP plate with the 2D-FFT method showed a good coincidence [19]. In addition, the relative systematic errors and the expanded uncertainty of the phase velocity A 0 mode were calculated using different filters, which confirmed the proposed reliability of the method for the GFRP plate [35].…”

Section: Methods Of Two Signals Analysissupporting

confidence: 61%

“…Using distances x 1 = 225 mm, x 2 = 237 mm (frequency range of 22-38 kHz, ∆x/λ = 0.3) and x 1 = 225 mm and x 2 = 231 mm (frequency range of 57-64 kHz, ∆x/λ = 0.3) of the A 0 mode, the two segments of the dispersion curves were reconstructed. The comparison of the results with 2D-FFT algorithm based on peaks of spectrum magnitude was performed, the mean relative error δ c ph = 1.3% for first reconstructed range (22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38) and δ c ph = 0.3% for second range (57-64 kHz) was determined. The total mean relative error δ c ph = 0.8% was calculated.…”

Section: Discussionmentioning

confidence: 99%

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Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

2021

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The possibilities of an effective method of two adjacent signals are investigated for the evaluation of Lamb waves phase velocity dispersion in objects of different types, namely polyvinyl chloride (PVC) film and wind turbine blade (WTB). A new algorithm based on peaks of spectrum magnitude is presented and used for the comparison of the results. To use the presented method, the wavelength-dependent parameter is proposed to determine the optimal distance range, which is necessary in selecting two signals for analysis. It is determined that, in the range of 0.17–0.5 wavelength where δcph is not higher than 5%, it is appropriate to use in the case of an A0 mode in PVC film sample. The smallest error of 1.2%, in the distance greater than 1.5 wavelengths, is obtained in the case of the S0 mode. Using the method of two signals analysis for PVC sample, the phase velocity dispersion curve of the A0 mode is reconstructed using selected distances x1 = 70 mm and x2 = 70.5 mm between two spatial positions of a receiving transducer with a mean relative error δcph=2.8%, and for S0 mode, x1 = 61 mm and x2 = 79.7 mm with δcph=0.99%. In the case of the WTB sample, the range of 0.1–0.39 wavelength, where δcph is not higher than 3%, is determined as the optimal distance range between two adjacent signals. The phase velocity dispersion curve of the A0 mode is reconstructed in two frequency ranges: first, using selected distances x1 = 225 mm and x2 = 231 mm with mean relative error δcph=0.3%; and second, x1 = 225 mm and x2 = 237 mm with δcph=1.3%.

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Section: Methods Of Two Signals Analysissupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

2021

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“…The reconstructed B-scan image ( Figure 8 b) was further processed by the adapted hybrid method using the spectrum decomposition and zero-crossing techniques in order to reconstruct variation of the phase velocity along the scanning line of the sample [ 35 , 36 ].…”

Section: The Signal Processingmentioning

confidence: 99%

A Novel Defect Estimation Approach in Wind Turbine Blades Based on Phase Velocity Variation of Ultrasonic Guided Waves

Raišutis

Tiwari

Žukauskas

et al. 2021

Sensors

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The reliability of the wind turbine blade (WTB) evaluation using a new criterion is presented in the work. Variation of the ultrasonic guided waves (UGW) phase velocity is proposed to be used as a new criterion for defect detection. Based on an intermediate value between the maximum and minimum values, the calculation of the phase velocity threshold is used for defect detection, location and sizing. The operation of the proposed technique is verified using simulation and experimental studies. The artificially milled defect having a diameter of 81 mm on the segment of WTB is used for verification of the proposed technique. After the application of the proposed evaluation technique for analysis of the simulated B-scan image, the coordinates of defect edges have been estimated with relative errors of 3.7% and 3%, respectively. The size of the defect was estimated with a relative error of 2.7%. In the case of an experimentally measured B-scan image, the coordinates of defect edges have been estimated with relative errors of 12.5% and 3.9%, respectively. The size of the defect was estimated with a relative error of 10%. The comparative results obtained by modelling and experiment show the suitability of the proposed new criterion to be used for the defect detection tasks solving.

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“…The proposed algorithm consists of several previously investigated and verified algorithms, which are described in detail and investigated in or publications [ 24 , 25 , 26 ]. The new algorithm is designed as a combination of those algorithms for solving newly raised problems.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The method used for evaluation and reconstruction of the segments of those curves exploiting only two signals measured at two close points was described in detail in [ 25 ]. The metrological performance of this technique was described in [ 26 ].…”

Section: Experimental Verificationmentioning

confidence: 99%

Simultaneous Measurement of Thickness and Elastic Properties of Thin Plastic Films by Means of Ultrasonic Guided Waves

Kažys

Tumšys

2021

Sensors

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Ultrasonic guided waves are already used for material characterization. The advantage of these waves is that they propagate in the plane of a plate and their propagation characteristics are sensitive to properties of the material. The objective of this research was to develop an ultrasonic method that could be used to measure the properties of thin plastic polyvinylchloride films (PVC). The proposed method exploits two fundamental Lamb wave modes, A0 and S0, for measurement of a thin film thickness and Young’s modulus. The Young’s modulus is found from the measured phased velocity of the S0 mode and the film thickness from the velocities of both A0 and S0 modes. By using the proposed semi-contactless measurement algorithm, the Young’s modulus and thickness of different thickness (150 µm and 200 µm) PVC films were measured. The uncertainty of thickness measurements of the thinner 150 µm PVC film is 2% and the thicker 200 µm PVC film is 3.9%.

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Metrological Performance of Hybrid Measurement Technique Applied for the Lamb Waves Phase Velocity Dispersion Evaluation

Cited by 7 publications

References 38 publications

Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

A Novel Defect Estimation Approach in Wind Turbine Blades Based on Phase Velocity Variation of Ultrasonic Guided Waves

Simultaneous Measurement of Thickness and Elastic Properties of Thin Plastic Films by Means of Ultrasonic Guided Waves

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